# -*- Mode: shell-script; -*-
# SPDX-License-Identifier: BSD-2-Clause
# X-SPDX-Copyright-Text: (c) Copyright 2003-2020 Xilinx, Inc.

# Source a config.mk file, converting Makefile assignments into shell
# variable assignments.
sourceconfig () {
  local tmpf=$(mktemp /tmp/mmakebuildtree.XXXXXX)
  sed "s/ *:= *\(.*\)$/='\1'/" <"$1" >$tmpf
  . $tmpf
  rm -f $tmpf
}


# If in build tree, find out where we are.  If not, return false.  Sets
# TOPPATH, BUILD, BUILDPATH, CURRENT, THISDIR and PLATFORM.
# and other vars from config.mk
orient-in-build-tree () {

  local cwd="$PWD"
  PLATFORM=
  BUILD=.
  CURRENT=

  # it is sometimes possible for $PWD to be unknown 
  if [ -z "$cwd" ]; then
     return 0
  fi
  while true; do
    # Stop early if we notice that we're about to move out of a tree.
    # if we get to /home we don't want to use [ -d x ] - it's automounted
    # and this may create new directories there (on some distributions)
    [ "$PWD" = /home -o "$PWD" = /net ] && break;
    [ -d build -a -d mk -a -d src -a -d scripts ] && break

    if [ -f "config.mk" ] ; then
      sourceconfig "config.mk"
      [ -z "$PLATFORM" ] && break
      THISDIR="${CURRENT%/}"
      CURRENT="src/$CURRENT"
      CURRENT="${CURRENT%/}"
      cd "$cwd"
      return  # i.e. fail if "cd" failed
    fi

    [ "$PWD" = / ] && break
    CURRENT=$(basename "$PWD")"/$CURRENT"
    BUILD="$BUILD/.."
    cd .. || break
  done

  cd "$cwd"
  return 1
}


# If anywhere in a ci check-out, find the top-level directory.  If not,
# return false.  Sets TOP, TOPPATH.
find-top () {
  local cwd="$PWD"
  TOP=.
  # it is sometimes possible for $PWD to be unknown 
  if [ -z "$cwd" ]; then
     cwd=.
  fi
  while true; do
    # if we get to /home we don't want to use [ -d x ] - it's automounted
    # and this may create new directories there (on some distributions)
    [ "$PWD" = /home ] && { cd "$cwd"; return 1; }
    [ -d src ] && [ -d mk ] && [ -d scripts ] && break
    [ "$PWD" = / ] && { cd "$cwd"; return 1; }
    TOP="$TOP/.."
    cd .. || { cd "$cwd"; return 1; }
  done
  cd "$cwd"
  TOPPATH=$(cd "$TOP" && /bin/pwd)
  return 0
}

